Journal
NANOSCALE
Volume 10, Issue 4, Pages 1930-1938Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr06956a
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Funding
- National Basic Research Program of China [2015CB932301]
- National Key Research and Development Program of China [2017YFA 0206801]
- National Natural Science Foundation of China [21771151, 21333008]
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Due to their distinctive structure, inherently anisotropic properties and broad applications, Janus colloidal particles have attracted tremendous attention and it is significant to synthesize high yield Janus colloidal particles in a cost-effective and reliable way. On the other hand, due to the expanded electromagnetic interference problems, it is highly desired to develop excellent electromagnetic wave absorbing materials with an ultra-wide absorption bandwidth for practical application. Herein, a confined liquid-solid redox reaction strategy has been developed to fabricate a series of Fe-x(CoyNi1-y)(100-x) ternary alloy particles. The as-prepared particles are in the form of u-channelled noncentrosymmetric spheres, one kind of Janus colloidal particles which have been rarely observed. Due to the combination and synergy effects of multi-magnetic metals, the polycrystalline structure and their specific morphology, the as-prepared particles possess multiple magnetic resonance and multiple dielectric relaxation processes, and therefore show excellent electromagnetic wave absorption performances. In particular, the strongest reflection loss (RL) of the Fe-15(Co0.2Ni0.8)(85) Janus colloidal particles is up to -36.9 dB with a thickness of 2.5 mm, and the effective absorption (RL < -10 dB) bandwidth can reach 9.2 GHz (8-17.2 GHz) with a thickness of 2 mm. Such a wide bandwidth has barely been reported for magnetic metal alloys under a single thickness. These results suggest that the Fe-x(CoyNi1-y)(100-x) Janus particles could be a promising candidate for highly efficient electromagnetic wave absorbing materials for practical application.
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